1665069228 has 36 divisors (see below), whose sum is σ = 4221016800. Its totient is φ = 553428576.

The previous prime is 1665069223. The next prime is 1665069239. The reversal of 1665069228 is 8229605661.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1665069223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53700 + ... + 78827.

Almost surely, 2^1665069228 is an apocalyptic number.

1665069228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1665069228 is an abundant number, since it is smaller than the sum of its proper divisors (2555947572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665069228 is a wasteful number, since it uses less digits than its factorization.

1665069228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132886 (or 132881 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 1665069228 is about 40805.2598080198. The cubic root of 1665069228 is about 1185.2521858188.

The spelling of 1665069228 in words is "one billion, six hundred sixty-five million, sixty-nine thousand, two hundred twenty-eight".